I had a funny problem yesterday. A switch from a customer refused to forward traffic on all non default VLANS, on an interface that was configured as a 802.1q trunk port. After resetting and applying just a basic configuration it worked. We ended the phone call after that, since it was clear that the problems isn’t caused by the ISP routers. Anyway I’m thinking about to call him again to ask if he could figure out what caused the problem

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